Give the molecular formula of a cyclic alkane, a cyclic alkene, a linear alkyne, and an aromatic

Give the molecular formula of a cyclic alkane, a cyclic...

Key Concepts

Saturated vs Unsaturated Hydrocarbons

Saturated hydrocarbons contain only single bonds between carbon atoms and have the maximum possible number of hydrogen atoms, making them less reactive under standard conditions. In contrast, unsaturated hydrocarbons contain one or more double or triple bonds, or have cyclic structures that inherently reduce the hydrogen count. This unsaturation makes them more reactive and alters their physical properties compared to their saturated counterparts.

Degree of Unsaturation

The degree of unsaturation, also known as the index of hydrogen deficiency, indicates the total number of rings and multiple bonds in a molecule. It is calculated based on the deviation from the hydrogen count in a fully saturated molecule. A higher degree of unsaturation means the compound contains more double or triple bonds or ring structures, which directly affects the molecular formula and reactivity of the hydrocarbon.

Hydrocarbon Classification

Hydrocarbons are organic compounds composed exclusively of carbon and hydrogen atoms. They are broadly divided into alkanes, alkenes, alkynes, and aromatic hydrocarbons based on the types of bonds between the carbon atoms and their overall structure. This classification helps chemists predict the chemical reactivity, physical properties, and types of reactions these compounds may undergo.

Molecular Formula Determination

Determining the molecular formula for a hydrocarbon involves counting the number of carbon atoms and adjusting the number of hydrogen atoms according to the degree of saturation and presence of structural features such as rings or multiple bonds. For example, fully saturated acyclic compounds follow the formula CnH2n+2, while cyclic compounds and those with multiple bonds have reduced hydrogen counts, following patterns like CnH2n or CnH2n-2.

Transcript

00:01 Let's now solve the problem from the chapter, chemistry of life, organic and biological chemistry.

00:06 Here in this problem, we have to give the molecular formula of a cyclic alkyne, cyclic alkyne, linear alkyne and an herometric hydrocarbon, having six carbon atoms.

00:19 So let's give the formula one by one.

00:22 With six carbon atom, the cyclic compound, simplest cyclic compound can be represented as ch2, ch2, ch2, ch2, ch2, ch2, ch2, ch2, ch2, ch2.

00:39 Six carbon atoms are arranged in the form of a cyclic ring with each carbon atom bonded to two hydrogen atoms.

00:46 So we can see that there are six carbon atoms and 12 hydrogen atoms in all.

00:51 So the molecular formula of the compound is c6h 12.

00:56 The next one is cyclic alken.

00:59 In alkenes, we know that double bond between carbon carbon is present.

01:04 So here, cyclic alken having a double bond between two carbon atoms can be represented as six carbon atoms arranged in the form of ring.

01:14 We are four carbon atoms have two hydrogen atoms bonded to them each and the other two carbon atoms are joined to each other by a double bond and contains one hydrogen atom.

01:25 So we can see that in this structure there are six carbon atoms.

01:29 Atoms and 10 hydrogen atoms.

01:33 So the cyclic alkyene with six carbon atoms has the molecular formula c6h 10.

01:41 The next one we have to write is for linear alkyne...

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